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The LLC will provide the limited liability you need for asset protection. Just remember, if you personally guarantee obligations you basically waive the benefits of limited liability with respect to that guarantee. Also, if you fail to adequately capitalize the business for the nature of the activities in which you plan to engage, you can also lose the benefits of limited liability through what is called piercing the corporate veil.
Since there are just the two of you, I see no need for a holding company. YOu should hold your respective interests in the entities you form to run the separate businesses directly. A holding adds a layer of cost plus creates the need for consolidated tax filings and accounting which is just an unnecessary expense.
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